Research Areas > Diagnosis of Biological Flows & Biomimetics

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Uptake of liquid from wet surfaces by the hairy proboscis

Post Image The tip region of the butterfly Asian comma proboscis was observed, especially two microstructures; the intake slits through which liquid passes into the proboscis and the brush-like sensilla styloconica. During liquid feeding, the sensilla styloconica region accumulates liquid by pinning the air-liquid interface to the tips of the sensilla styloconica. The flow that passes through the sensilla styloconica region shows a parabolic velocity profile, and the corresponding flow rate is proportional to the cubed length of the sensilla styloconica.  This results demonstrated that ...   내용 보기

Liquid-feeding strategy of a butterfly

Post Image  A butterfly drinks liquid food through a long coiled proboscis with a pressure gradient induced by a cibarial pump. However, the long and coiled proboscis make it difficult to position the proboscis tip at the liquid target. In addition, the flow resistance in the slender tube is very high. To compensate for these disadvantages, the butterfly proboscis possesses line sink which makes liquid probing easy. In addition, dynamic motions of the butterfly pump exhibit large stroke volume to adapt high flow resistance in the long proboscis.   내용 보기

Active ion-mediated sap flow regulation in plants

Post Image The ion-responsiveness of water transport was investigated to understand the mechanism of active water flow regulation in plants. Different ion types significantly affected water transport in xylem conduits. Sap flow rate decreased with an increasing K+/Ca2+ ratio, while a decrease in the ionic ratio accelerated the ascent of ionic solution. The mechanism of interactive ionic effects was conjectured in a physicochemical standpoint.     내용 보기

Two-photon imaging of intracellular chloroplast movements

Post Image \\Intracellular 3D movements of chloroplasts in intact plant leaves were monitored during dark to light transitions by a TPM system. All chloroplasts did not exhibit the same motion in response to irradiation variation. Spatial heterogeneity in chloroplast motility underlines the importance of monitoring intracellular orientation and movement of individual chloroplasts across intact leaves.   내용 보기

Real-time imaging of pulvinus bending in Mimosa pudica

Post Image Structural characteristics and seismonastic reactions of M. pudica were experimentally investigated using advanced bio-imaging techniques. The results show that the key factors for the flexible movements by the pulvinus are the following: bendable xylem bundle, expandable/shrinkable epidermis, tiny wrinkles for surface modification, and a xylem vessel network for efficient water transport.   내용 보기

Gold nanoparticles as tracer of plants’ sap flow

Post Image In order to use gold nanoparticle(AuNP) with synchrotron X-ray imaging as a tool for visualize hydraulics in xylem vessel, interaction with the vascular network is verified. Effects of AuNP supply on the water refilling function of  monocot species are investigated by the refilling process in sample leaves with X-ray imaging and evaporative water loss. The function was virtually unaffected, but discrepancy in the water uptakes starts to appear at about 20 min to 40 min after the supply of AuNP solution.   내용 보기

Journey of water in pine cones

Post Image Pine cones have structural advantages that could influence the efficient motion of pine cones. Raindrops fall along the outer scales to the three layers (bract scales, fibers and innermost lignified structure) of inner pine cones. However, not all the layers but only the bract scales get wet and then, most raindrops move to the inner scales. These systems reduce the amount of water used and minimize the time spent on structural changes.   내용 보기

Basic physics of transpiration at plant leaves

Post Image Plant leaves have porous structures to pull water from root to the tip of leaves, and they finally release water to the air. The morphological structure of plant leaves has been optimized to efficiently transport water. Inspired by the morphological structure of mesophyll cells, analogous models were fabricated using hydrogel to study the effect of pore size on water transport. The hydrogel model with nano-/microporous hierarchical structure induced higher evaporation and greater swelling ratio, compared with the model with nanoporous unitary structure.   내용 보기

Effective mass transport through porous materials

Post Image Mass transport in porous materials attracts large attention in many engineering applications. Plant leaves, which work as natural hydraulic pumps for water uptake, have evolved to have the morphological structure for fast water transport of leaf transpiration.  Inspired by the tissue organization of plant leaves, analogous double-layered porous models were fabricated using agarose hydrogel. Solute transport through the hydrogel models with different structures was investigated experimentally and theoretically. The hydrogel models with widely dispersed pores at a fixed porosity ar...   내용 보기

Natural Pattern Formation II. Optimum periodicity

Post Image Dynamically repeated periodic patterns are abundant in natural and artificial systems, such as tides, heart beats, stock prices, and the like. The characteristic repeatability and periodicity are expected to be optimized in effective system-specific functions. In this study, such optimum periodicity is experimentally evaluated in terms of effective mass transport using one-valve and multi-valve systems working in contractile fluid flows. A set of nanoscale gating functions is utilized, operating in nanocomposite networks through which permeates selectively pass under characteristic co...   내용 보기